Objectives

To estimate population based incidence rates of gonorrhoea in an inner London area and examine relations with age, ethnic group, and socioeconomic deprivation.

Design

Cross sectional study.

Setting

11 departments of genitourinary medicine in south and central London.

Subjects

1978 first episodes of gonorrhoea diagnosed in 1994 and 1995 in residents of 73 electoral wards in the boroughs of Lambeth, Southwark, and Lewisham who attended any of the departments of genitourinary medicine.

Main outcome measures

Yearly age, sex, and ethnic group specific rates of gonorrhoea per 100 000 population aged 15-59 years ; rate ratios for the effects of age and ethnic group on gonorrhoea rates in women and men before and after adjustment for confounding factors.

Results

Overall incidence rates of gonorrhoea in residents of Lambeth, Southwark, and Lewisham were 138.3 cases yearly per 100 000 women and 291.9 cases yearly per 100 000 men aged 15-59 years.

At all ages gonorrhoea rates were higher in non-white minority ethnic groups.

Rate ratios for the effect of age adjusted for ethnic group and underprivilege were 15.2 (95% confidence interval 11.6 to 19.7) for women and 2.0 (1.7 to 2.5) for men aged 15-19 years compared with those over 30.

After deprivation score and age were taken into account, women from black minority groups were 10.5 (8.6 to 12.8) times as likely and men 11.0 (9.7 to 12.6) times as likely as white people to experience gonorrhoea. (...)